If you are on a budget and really want to convert to i-beams contact Perry McNeil. It may not be the prettiest looking fabrication; but the man knows his beams. It will be solid as sh!t, cheap as sh!t, and if something doesn't work or breaks he stand by his sh!t and will fix it. PM me for his cell # if you want it.
Here is a Toyota he has done..
http://www.mcneilracinginc.com/off-road-suspension-and-fabrication/suspension/index.htm#
Here is a Toyota he has done..
http://www.mcneilracinginc.com/off-road-suspension-and-fabrication/suspension/index.htm#